Its double cone forms the limit of a trachytic belt which stands out distinctly in the mountain system of the island.

它的双锥体形成了粗面岩带的边界， 该粗面岩带在岛上的山系中尤为突出。

Take birds who have great vision—the pigeon has once been described as “two eyes with wings”—with “double cones” which enable them to see ultraviolet wavelengths and give them sharp color vision.

以视力很好的鸟类为例——鸽子曾经被描述为“长着翅膀的两只眼睛”——它们有“双锥体”，这使它们能够看到紫外线波长，并赋予它们敏锐的色觉。